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Inventories (Summary Of Inventory) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished products - FIFO basis $ 223.0 $ 259.2
Less LIFO reserve - finished products (101.3) (160.8)
Finished products - LIFO basis 121.7 98.4
Store merchandise for resale 152.0 123.0
Materials and supplies 5.4 6.2
Total inventories 279.1 227.6
LIFO carrying reserve $ 101.3 $ 160.8